(not) the be-all and end-all
(Not) the most important event or thing. My little sister thinks that a date with the captain of the football team is just the be-all and end-all of her life right now. Oh, honey, I know you're disappointed, but failing the driver's license test is not the be-all and end-all. You'll just practice some more and then take it again. I once thought that not getting into Harvard was the be-all and end-all of my academic career. Thankfully, I was wrong.
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